Adtranz designed an innovative energy management system for the new IC-2000
coaches for Swiss SBB. One of the targets was a smoothened operation of
air-conditioning, i.e. keeping the air-conditioning system from over-reacting to
short-term variations in outside climatic conditions. For example: When the
train enters a tunnel, external temperature sensors recognize the steep
temperature change as transitory and the control keeps the air-conditioning
system from turning on the heating.
The same system foresees excess ventilation in the case of
overheating due to sunshine through windows.